Complete-A-Sketch™ 123™ has been created specifically for families to use in their home. It includes all of the works from Complete-A-Sketch, Volumes 1, 2, 3 with 7 exclusive bonus projects. Complete-A-Sketch™ 123™ has a single user license. In short this means that this CD is for individual use. The bonus materials introduce some drafting concepts and include modeling projects.